2" lift w/30x10.5 tires wheel backspacing?

i'm just doing a small lift and 30's what size backspacing should I go with on my '90 XJ?

Depends on what you are doing with the jeep. I currently run 4" bs on mine but if it flexes I rub the fender lip stuffing with the sway connected. Never have a problem on the street so if that's all you are doing you will be fine